The use of sulphur to vulcanize rubber is to make it?
A. blacker B. cheaper C. more elastic D. tougher E. softer Correct Answer: Option D – tougher
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is?
A. 1 B. 2 C. 3 D. 4 E. 5 Correct Answer: Option C – 3
Animal charcoal differs from wood charcoal in that it?
A. has a dark colour B. has a high carbon content C. is a good absorbent D. is crystalline. E. is rich in phosphate content Correct Answer: Option E – is rich in phosphate content Explanation Animal charcoal or bone black is the carbonaceous residue obtained by...
Which statement BEST describes the process of oxidation?
A. addition of hydrogen B. loss of oxygen C. decrease in oxidation number D. loss of electrons E. gain of elections. Correct Answer: Option D – loss of electrons
The decreasing order of the oxidizing power of the halogens is?
A. Br>I>Cl>F B. F>I>Cl>Br C. F>Cl>Br>l D. I>Br>Cl>F E. Cl>Br>F>I Correct Answer: Option C – F>Cl>Br>lProducts
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